html,body{
    margin: 0;
    padding: 0;
    border: 0;
    width: 100%;
    height: 100%;
}
section{
    width: 750px;
    height: 1210px;
    background: url("../image/bj2x.png");
    background-size: 100% 100%;
    margin: 0 auto;
}
#img{
    text-align: center;
}
.logo{
    width: 30%;
    margin-top: 141px;
}
#btn{
    margin-top: 104px;
    text-align: center;
}
.img{
    margin-top: 16px;
}
@media screen and (min-width: 300px) and (max-width: 360px){
    section{
        width: 100%;
        height: 100%;
        margin: 0;
    }
    .logo{
        width: 25%;
        margin-top: 91px;
    }
    #btn{
        width: 100%;
        margin-top: 84px;
        text-align: center;
    }
    .img{
        width: 80%;
        margin-top: 16px;
    }
}
@media screen and (min-width: 361px) and (max-width: 450px){
    section{
        width: 100%;
        height: 100%;
        margin: 0;
    }
    .logo{
        width: 30%;
        margin-top: 141px;
    }
    #btn{
        width: 100%;
        margin-top: 94px;
        text-align: center;
    }
    .img{
        width: 80%;
        margin-top: 16px;
    }
}
@media screen and (min-width: 451px) and (max-width: 720px){
    section{
        width: 100%;
        height: 1024px;
        margin: 0;
    }
    .logo{
        width: 35%;
        margin-top: 141px;
    }
    #btn{
        width: 100%;
        margin-top: 74px;
        text-align: center;
    }
    .img{
        width: 80%;
        margin-top: 16px;
    }
}
@media screen and (min-width: 721px) and (max-width: 1024px){
    section{
        width: 100%;
        height: 1280px;
        margin: 0;
    }
    .logo{
        width: 40%;
        margin-top: 211px;
    }
    #btn{
        width: 100%;

        margin-top: 94px;
        text-align: center;
    }
    .img{
        width: 80%;
        margin-top: 16px;
    }
}
@media screen and (min-width: 1025px) and (max-width: 1280px){
    section{
        width: 100%;
        height: 1280px;
        margin: 0 auto;
    }
    .logo{
        width: 40%;
        margin-top: 131px;
    }
    #btn{
        width: 100%;

        margin-top: 94px;
        text-align: center;
    }
    .img{
        width: 80%;
        margin-top: 16px;
    }
}